serial.c

通过讨论常见的串口软件使用的方法

/*----------------------------------------------------------------------------------
File: 					serial.h
Author: 				Qiu Peng   [[e-mail]]
Note:					serial driver for Intel 196KC
Create Date:			2004.3.10
Last Modified:			2004.6.20
-----------------------------------------------------------------------------------*/

#ifndef  OS_MASTER_FILE
#include "includes.h"
#endif

unsigned char TxBuf[LenTxBuf],RxBuf[LenRxBuf];	//收发缓冲区实体
unsigned char *inTxBuf,*outTxBuf,*inRxBuf,*outRxBuf;	//收发缓冲区读写指针,采用循环使用的方式
INT8U TIflag=1;	

void InitSerial(void)	//串口初始化
{
	__SP_CON = 0x01;		//MODE 1
    __BAUD_RATE = 0x47;		//11.0592MHz,  BAUD_REG = (XTAL1)/(BAUD_RATE * 16) - 1
    __BAUD_RATE = 0x80;
    __IOC1 = __IOC1|0x20;		//IOC1.5 = 1
    __INT_MASK1 |= 0x01;
    
    SerialTxCount = 0;
    SerialRxCount = 0;
}

void InitSerialBuffer(void)		//串口缓冲区初始化
{
	inTxBuf = TxBuf;
	outTxBuf = TxBuf;
	inRxBuf = RxBuf;
	outRxBuf = RxBuf;	
}

void SerialTx(void)	//串口中断服务子程序
{
    if(inTxBuf==outTxBuf) 
    	{TIflag=1;return;}		//TxBuf Empty
    	
    __SBUF=*outTxBuf; outTxBuf++;
    if(outTxBuf==TxBuf+LenTxBuf) outTxBuf=TxBuf;
    
    //__INT_PEND1 |= 0x01;	//!仿真时软件触发，硬件仿真或onboard时去掉。
    SerialTxCount++;
}

void PrintChar(unsigned char ch)		//显示字符
{
        unsigned char *t;

        t=inTxBuf;t++;
        if(t==TxBuf+LenTxBuf) t=TxBuf;
        if(t==outTxBuf) 
        	return;                  //TxBuf Full
        *inTxBuf=ch;
        inTxBuf=t;
        
        if(TIflag)
        {		
            TIflag=0;
            __INT_PEND1 |= 0x01;		//手工触发第一次serial中断
        }
}

void PrintStr(unsigned char *str)		//显示字符串
{
        int i;
        unsigned char j;
        unsigned char ch;
        
        for(i=0;i<MaxLenStr;i++)
        {
            ch=*(str+i);
            if(ch=='\0') break;
            else if(ch=='\n'){PrintChar(10);PrintChar(13);} 
            else if(ch=='\t')
            {
                for(j=0; j<TABNum; j++)
                        PrintChar(' ');
            }
            else PrintChar(ch);
        }
		
}

void PrintCh(unsigned char ch)	
{
        if(ch>='0'&&ch<='9') ch=ch+'0';
        else ch=ch+'A'-10;
        PrintChar(ch);
}

void PrintByte(unsigned char Byte)
{
        //EA=0;        
        insidePrintByte(Byte);                
        //EA=1;
}

//Serial receive
void SerialRx(void)	//串口中断服务子程序
{
	unsigned char *t;

    //RI=0;
    t=inRxBuf;t++;
    if(t==RxBuf+LenRxBuf) t=RxBuf;
    if(t==outRxBuf) return;                 //RxBuf Full
    *inRxBuf=__SBUF;
    inRxBuf=t;
    
    SerialRxCount++;
}

void  GetSerialCh(unsigned char *ch)		//从串口缓冲区读1字节数据
{
	if(inRxBuf==outRxBuf)
	  return;
		
    *ch=*outRxBuf;  outRxBuf++;
    if(outRxBuf==RxBuf+LenRxBuf) outRxBuf=RxBuf;      
    return;	
}